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/* Test of create_pipe_bidi/wait_subprocess.
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Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "wait-process.h"
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/* Depending on arguments, this test intentionally closes stderr or
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starts life with stderr closed. So, we arrange to have fd 10
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(outside the range of interesting fd's during the test) set up to
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duplicate the original stderr. */
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#define BACKUP_STDERR_FILENO 10
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#define ASSERT_STREAM myerr
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/* Code executed by the child process. argv[1] = "child". */
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child_main (int argc, char *argv[])
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char buffer[2] = { 's', 't' };
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/* Read one byte from fd 0, and write its value plus one to fd 1.
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fd 2 should be closed iff the argument is 1. Check that no other file
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descriptors leaked. */
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ASSERT (read (STDIN_FILENO, buffer, 2) == 1);
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ASSERT (write (STDOUT_FILENO, buffer, 1) == 1);
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ret = dup2 (STDERR_FILENO, STDERR_FILENO);
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switch (atoi (argv[2]))
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/* Expect fd 2 is open. */
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ASSERT (ret == STDERR_FILENO);
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/* Expect fd 2 is closed. */
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ASSERT (errno == EBADF);
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for (fd = 3; fd < 7; fd++)
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ASSERT (close (fd) == -1);
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ASSERT (errno == EBADF);
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/* Create a bi-directional pipe to a test child, and validate that the
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child program returns the expected output. The child is the same
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program as the parent ARGV0, but with different arguments.
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STDERR_CLOSED is true if we have already closed fd 2. */
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test_pipe (const char *argv0, bool stderr_closed)
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char buffer[2] = { 'a', 't' };
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argv[0] = (char *) argv0;
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argv[1] = (char *) "child";
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argv[2] = (char *) (stderr_closed ? "1" : "0");
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pid = create_pipe_bidi (argv0, argv0, argv, false, true, true, fd);
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ASSERT (STDERR_FILENO < fd[0]);
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ASSERT (STDERR_FILENO < fd[1]);
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/* Push child's input. */
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ASSERT (write (fd[1], buffer, 1) == 1);
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ASSERT (close (fd[1]) == 0);
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/* Get child's output. */
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ASSERT (read (fd[0], buffer, 2) == 1);
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/* Wait for child. */
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ASSERT (wait_subprocess (pid, argv0, true, false, true, true, NULL) == 0);
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ASSERT (close (fd[0]) == 0);
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/* Check the result. */
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ASSERT (buffer[0] == 'b');
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ASSERT (buffer[1] == 't');
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/* Code executed by the parent process. */
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parent_main (int argc, char *argv[])
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/* Selectively close various standard fds, to verify the child process is
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not impacted by this. */
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test = atoi (argv[1]);
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/* Plug any file descriptor leaks inherited from outside world before
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starting, so that child has a clean slate (at least for the fds that we
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might be manipulating). */
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for (fd = 3; fd < 7; fd++)
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test_pipe (argv[0], test >= 4);
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main (int argc, char *argv[])
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fprintf (stderr, "%s: need arguments\n", argv[0]);
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if (strcmp (argv[1], "child") == 0)
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/* fd 2 might be closed, but fd BACKUP_STDERR_FILENO is the original
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myerr = fdopen (BACKUP_STDERR_FILENO, "w");
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return child_main (argc, argv);
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/* We might close fd 2 later, so save it in fd 10. */
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if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
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|| (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
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return parent_main (argc, argv);